From a5a2a406f8d65f0e852d9ed7fbfb630c6b81dd7f Mon Sep 17 00:00:00 2001 From: Pádraig Brady Date: Wed, 17 Dec 2008 11:30:03 +0000 Subject: stdbuf: A new program to run a command with modified stdio buffering * AUTHORS: Register as the author. * NEWS: Mention this change. * README: Add stdbuf command to list. * configure.ac: Only enable on ELF systems with GCC. * cfg.mk (sc_system_h_headers): Use VC_LIST_EXCEPT rather than VC_LIST, so we can add an exception, if needed. * .x-sc_system_h_headers: New file. Exempt libstdbuf.c. * Makefile.am (syntax_check_exceptions): Add .x-sc_system_h_headers. * doc/coreutils.texi (stdbuf invocation): Add stdbuf info. * man/.gitignore: Ignore generated manpage. * src/.gitignore: Ignore stdbuf and libstdbuf.so binaries. * man/Makefile.am (stdbuf.1): Add dependency. * man/stdbuf.x: New file with example usage. * po/POTFILES.in: Reference new command and shared library sources. * src/Makefile.am (build_if_possible__progs): Add stdbuf and libstdbuf, (pkglib_PROGRAMS): Reference optional shared lib, (libstdbuf_so_LDADD): Ensure we don't link with non PIC libcoreutils.a. (libstdbuf_so_LDFLAGS): Add -shared GCC option, (libstdbuf_so_CFLAGS): Add -fPIC GCC option. (check-README): Exclude libstbuf. (check-AUTHORS): ditto. (sc_tight_scope): Exclude functions starting with __. * src/libstdbuf.c: The LD_PRELOAD shared library to control buffering. * src/stdbuf.c: New file to setup env variables before execing command. * tests/Makefile.am: Reference new test file. * tests/misc/help-version: Set expected exit codes. * tests/misc/invalid-opt: ditto. * tests/misc/stdbuf: Add 9 tests. --- tests/misc/stdbuf | 86 +++++++++++++++++++++++++++++++++++++++++++++++++++++++ 1 file changed, 86 insertions(+) create mode 100755 tests/misc/stdbuf (limited to 'tests/misc/stdbuf') diff --git a/tests/misc/stdbuf b/tests/misc/stdbuf new file mode 100755 index 000000000..6f79e771f --- /dev/null +++ b/tests/misc/stdbuf @@ -0,0 +1,86 @@ +#!/bin/sh +# Exercise stdbuf functionality + +# Copyright (C) 2009 Free Software Foundation, Inc. + +# This program is free software: you can redistribute it and/or modify +# it under the terms of the GNU General Public License as published by +# the Free Software Foundation, either version 3 of the License, or +# (at your option) any later version. + +# This program is distributed in the hope that it will be useful, +# but WITHOUT ANY WARRANTY; without even the implied warranty of +# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the +# GNU General Public License for more details. + +# You should have received a copy of the GNU General Public License +# along with this program. If not, see . + +if test "$VERBOSE" = yes; then + set -x + stdbuf --version +fi + +. $srcdir/test-lib.sh +getlimits_ + +# Use a fifo rather than a pipe in the tests below +# so that the producer (uniq) will wait until the +# consumer (dd) opens the fifo therefore increasing +# the chance that dd will read the data from each +# write separately. +mkfifo fifo || framework_failure + +fail=0 + +# Verify input parameter checking +stdbuf -o1 true || fail=1 # verify size syntax +stdbuf -oK true || fail=1 # verify size syntax +stdbuf -o0 true || fail=1 # verify unbuffered syntax +stdbuf -oL true || fail=1 # verify line buffered syntax +stdbuf -ol true && fail=1 # Capital 'L' required +stdbuf -o$SIZE_OFLOW true && fail=1 # size too large +stdbuf -iL true && fail=1 # line buffering stdin disallowed + +# Ensure line buffering stdout takes effect +printf '1\n' > exp +dd count=1 if=fifo > out 2> err & +(printf '1\n'; sleep .2; printf '2\n') | stdbuf -oL uniq > fifo +wait # for dd to complete +compare out exp || fail=1 + +# Ensure un buffering stdout takes effect +printf '1\n' > exp +dd count=1 if=fifo > out 2> err & +(printf '1\n'; sleep .2; printf '2\n') | stdbuf -o0 uniq > fifo +wait # for dd to complete +compare out exp || fail=1 + +# Ensure un buffering stdin takes effect +# The following works for me, but is racy. I.E. we're depending +# on dd to run and close the fifo before the second write by uniq. +# If we add a sleep, then we're just testing -oL + # printf '3\n' > exp + # dd count=1 if=fifo > /dev/null 2> err & + # printf '1\n\2\n3\n' | (stdbuf -i0 -oL uniq > fifo; cat) > out + # wait # for dd to complete + # compare out exp || fail=1 +# One could remove the need for dd (used to close the fifo to get uniq to quit +# early), if head -n1 read stdin char by char. Note uniq | head -c2 doesn't +# suffice due to the buffering implicit in the pipe. sed currently does read +# stdin char by char, so we can test with `sed 1q`. However I'm wary about +# adding this dependency on a program outside of coreutils. + # printf '2\n' > exp + # printf '1\n2\n' | (stdbuf -i0 sed 1q >/dev/null; cat) > out + # compare out exp || fail=1 + +# Ensure block buffering stdout takes effect +# We don't currently test block buffering failures as +# this doesn't work on on GLIBC-2.7 or GLIBC-2.9 at least. + # printf '1\n2\n' > exp + # dd count=1 if=fifo > out 2> err & + # (printf '1\n'; sleep .2; printf '2\n') | stdbuf -o4 uniq > fifo + # wait # for dd to complete + # compare out exp || fail=1 + +Exit $fail -- cgit v1.2.3-70-g09d2